[Bug tree-optimization/60452] [4.8/4.9 Regression] wrong code at -O1 on x86_64-linux-gnu (affecting trunk and 4.8.x)

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60452

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Can be simplified into:
int a;

int
main ()
{
  int e[2] = { 0, 0 }, f = 0;
  if (a == 131072)
    f = e[a];
  return f;
}
which then starts to crash even starting from 4.3 or so (in between r125500 and
r126000).

The problem is that ifcvt.c doesn't consider e[131072], clearly out of bound
access to an automatic array, as possibly trapping/faulting.